Physics and Engineering of Radiation Detection

11.3. Passive Dosimetry 631

Table 11.3.1: Common TL dosimeters.

Material Commercial Name

LiF:Mg,Ti TLD-100

LiF:Mg,Cu,P TLD-100H

LiF:Mg,Ti TLD-600

LiF:Mg,Cu,P TLD-600H

LiF:Mg,Ti TLD-700

LiF:Mg,Cu,P TLD-700H

CaF 2 :Dy TLD-200

CaF 2 :Mn TLD-400

AlO 2 :C TLD-500

Li 2 B 4 O 7 :Mn TLD-800

CaSO 4 :Dy TLD-900

Dose Rate: TL dosimeters can not be used to measure dose rate. However,

theaveragedose rate can be estimated by dividing the absorbed dose by the

exposure time. For accurate dose rate measurements, an electronic detector is

more suitable.

Types of Radiation: There is no universal TL material that can be used

to measure dose from all types of radiation. For example, there are some

very good materials that measure dose fromγ-rays but they are not good for

neutrons. A good strategy in this case is to use a combination of materials in

the environment where different types of radiation are expected to be present.

11.3.BOpticallyStimulatedLuminescenceDosimetry

Thermal stimulation is not the only means of retrieving stored energy from materials.
There are also materials, which emit light when stimulated by light photons. These
materials, called optically stimulated luminescence or simply OSL materials, form
a new class of dosimeters with qualities much superior than the conventional TL
dosimeters. The OSL materials can store energy in the same way as TL materials
but they give off light when stimulated optically instead of thermally as in the case
of TLDs. This is a relatively new technology and was mostlyunheard of before 1992.